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OpenStudy (anonymous):
proof that (cos a-b)=cos acos b+sin asin b
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OpenStudy (lochana):
yeah. I know this statement well. but I have no idea how to prove it. but let me try:D
OpenStudy (lochana):
oh I can't do that :(. but I found this one online. http://www.themathpage.com/atrig/sum-proof.htm hope this will help you.
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